CN106766974B - A kind of air/fuel ratio detecting apparatus - Google Patents
A kind of air/fuel ratio detecting apparatus Download PDFInfo
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- CN106766974B CN106766974B CN201611226213.1A CN201611226213A CN106766974B CN 106766974 B CN106766974 B CN 106766974B CN 201611226213 A CN201611226213 A CN 201611226213A CN 106766974 B CN106766974 B CN 106766974B
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- air
- combustion
- furnace
- fuel ratio
- data processing
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D19/00—Arrangements of controlling devices
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D27/00—Simultaneous control of variables covered by two or more of main groups G05D1/00 - G05D25/00
- G05D27/02—Simultaneous control of variables covered by two or more of main groups G05D1/00 - G05D25/00 characterised by the use of electric means
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Automation & Control Theory (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Regulation And Control Of Combustion (AREA)
Abstract
The invention belongs to instrument to detect correlative technology field, and it discloses a kind of air/fuel ratio detecting apparatus, the air/fuel ratio detecting apparatus includes combustion furnace, resistance wire, oxygen analyser and data processing control center.The combustion furnace include burn furnace shell and be contained in it is described burning furnace shell in boiler tube；The resistance wire is wound on the boiler tube, and the resistance wire is in running order or idle state for controlling for the data processing control center, so that the temperature in the combustion furnace maintains operating temperature；The oxygen analyser is connected to the combustion furnace, its residual oxygen content for the being used for real-time detection flue gas and residual oxygen content data that will test are transferred to the data processing control center, the data processing control center handles the residual oxygen content data to obtain the completely burned air-fuel ratio that fuel gases calorific value is in variable condition, and then the excess air coefficient as needed for each furnace section of industrial furnace corrects the air-fuel ratio of each furnace section, realizes the raising of industrial furnace efficiency of combustion.
Description
Technical field
The invention belongs to instrument to detect correlative technology field, more particularly, to a kind of air/fuel ratio detecting apparatus.
Background technique
Currently, the type of combustion furnace gas described in domestic large-scale synthesis steel rolling mill is mainly blast furnace gas and mixed gas
(high coke mixed gas, Gao Jiaozhuan mixed gas).In the actual production process, because of the variation of coal resource and usage amount
(furnace body wind or when expecting, gas consumption increase；When combustion furnace specification, kind, yield described in each production line change,
Will cause coal gas usage amount and manifold pressure fluctuation), Gao Jiao or high coke turn mixed gas using matching unstable and coal gas
The factors such as buffer capacity deficiency can all influence fluctuating widely for calorific value of gas, seriously affect the combustion case of mixed gas, lead
It causes the proportion of air and combustion gas to be difficult to adjust, leads to a large amount of billet oxidization burning loss and heat loss due to exhaust gas, increase the combustion furnace energy consumption,
It is unfavorable for environmental protection and energy saving.
Steel mill measures the proportion of fuel gases calorific value real-time regulating gas and air by combustion-type caloric value instrument mostly.Burning
Formula caloric value instrument high degree of automation can carry out continuous, online automatic detection in the case where calorific value of gas changes to calorific value
With control signal is provided, but its higher cost, accuracy rate is lower, and when work specifically has the following problems: 1. burning conditions pair
Test result is affected, such as the variation of admission pressure, gas source, and specific aim is needed to do amendment adjustment.According to the technology of caloric value instrument
Demand, caloric value instrument burner noz(zle) admission pressure must be consistent with the wind pressure of caloric value instrument itself, if pressure deviates this value, then can
Caloric value instrument testing result is set to generate deviation；2. more demanding to combustion gas pretreatment system to guarantee continuous operation effect.It is live pre-
Processing unit redundancy is complicated, and the maintenance workload of pretreatment system is larger when breaking down.
Summary of the invention
Aiming at the above defects or improvement requirements of the prior art, the present invention provides a kind of air/fuel ratio detecting apparatus, bases
In the work characteristics of combustion furnace, designed for air/fuel ratio detecting apparatus.On the boiler tube of the air/fuel ratio detecting apparatus around
Resistance wire processed, the convenient occasion that efficiency of combustion is influenced when ignition temperature fluctuates larger of the resistance wire control the temperature in combustion furnace
Degree guarantees operating temperature, while can preferably make in-furnace temperature uniform；The data processing control center and the resistance wire
Achievable combustion furnace A.T.C is matched, efficiency of combustion is improved, makes combustion gas completely burned.In addition, using oxygen analyser reality
When detect flue gas oxygen-containing residual, and then through the data processing control center processing after can be achieved real-time monitoring combustion furnace combustion
Burning state reduces oxidization burning loss rate and flue gas loss, and structure is simple so that heating furnace air-fuel ratio control precision can be improved,
Cost is relatively low.
To achieve the above object, the present invention provides a kind of air/fuel ratio detecting apparatus, and it is suitable for industrial furnace combustion gas is preposition
Detection, the air/fuel ratio detecting apparatus includes combustion furnace, resistance wire, oxygen analyser and data processing control center, it is characterised in that:
The combustion furnace include burn furnace shell and be contained in it is described burning furnace shell in boiler tube；The resistance wire is wound on
It on the boiler tube, is electrically connected with the data processing control center, the data processing control center is described for controlling
Resistance wire is in running order or idle state, so that the temperature in the combustion furnace maintains operating temperature；
The oxygen analyser is connected to the back-end ductwork of the combustion furnace, is used for the flue gas in real-time detection back-end ductwork
Residual oxygen content, and the residual oxygen content data that will test are transferred to the data processing control center, the data processing and control
The residual oxygen content data that center processing receives to obtain the completely burned air-fuel ratio that fuel gases calorific value is in variable condition, into
And the excess air coefficient as needed for each furnace section of industrial furnace corrects the air-fuel ratio of each furnace section, realizes mentioning for industrial furnace efficiency of combustion
It is high.
Further, the air/fuel ratio detecting apparatus further include the temperature sensor being separately positioned on the combustion furnace and
Pressure sensor, the temperature sensor are used to detect the temperature in the combustion furnace, and the temperature data that will test
It is transferred to the data processing control center；The pressure sensor is used to detect the pressure in the combustion furnace, and will test
To pressure data be transferred to the data processing control center, the data processing control center is according to the temperature received
Combustion case in the burner hearth of degree evidence and the pressure data to monitor the combustion furnace.
Further, the air/fuel ratio detecting apparatus further includes cooling air pipe, and the cooling air pipe is connected to described
The back-end ductwork of combustion furnace, for cooling down to the flue gas in the back-end ductwork.
Further, the combustion furnace is provided with set temperature, and the data processing control center judges the temperature received
The set temperature of degree and the oxygen analyser, when the temperature received is greater than the set temperature, in the data processing and control
The heart controls the cooling air pipe and starts to work to reduce the temperature in the back-end ductwork, and then the temperature in the back-end ductwork
Degree maintains in the operating temperature range of the oxygen analyser；When what the data processing control center received comes from the temperature
When the temperature of sensor is less than the set temperature of the combustion furnace, the data processing control center controls the resistance wire and starts
Work, until the temperature that the data processing control center receives is in the range of the set temperature.
Further, the air/fuel ratio detecting apparatus further includes burner, is also respectively provided on the burner combustion-supporting
Air intake and fuel gas inlet, the burner are used for the combustion air from the combustion air inlet and come from the combustion
The combustion gas of gas entrance is transmitted in the boiler tube after being mixed.
Further, the data processing control center is also used to control the combustion air inlet and the fuel gas inlet
To control the volume for the combustion air for entering the combustion-supporting and the volume of the combustion gas, and then controls and enter the boiler tube
The volume ratio of the interior combustion air and the combustion gas.
Further, the oxygen analyser includes the oxygen sensors and analyzer for being connected to the combustion furnace, the analysis
Instrument connects the oxygen sensors and the data processing control center.
Further, the oxygen analyser is Oxygen Analyser on Zirconia Cell, and the oxygen sensors are zircite oxygen transmitter.
Further, the screw pitch at the resistance wire both ends is less than in-between screw pitch, and the resistance wire is closed by nickel chromium triangle
Made of gold.
Further, predetermined space, the combustion furnace are provided between the boiler tube and the inner wall of the burning furnace shell
Thermal insulation material is filled between shell and the boiler tube, the thermal insulation material is for keeping the temperature the combustion furnace.
In general, through the invention it is contemplated above technical scheme is compared with the prior art, sky provided by the invention
Combustion is than detection device, coiling resistance wire on boiler tube, and the resistance wire is convenient to influence burning effect when ignition temperature fluctuation is larger
Temperature in the occasion control combustion furnace of rate, guarantees operating temperature, while can preferably make in-furnace temperature uniform；The data
Processing control centre matches achievable combustion furnace A.T.C with the resistance wire, improves efficiency of combustion, keeps combustion gas complete
Full burning.In addition, using the oxygen-containing residual of oxygen analyser real-time detection flue gas, and then after data processing control center processing
The combustion state of real-time monitoring combustion furnace can be achieved, industrial furnace air-fuel ratio control precision can be improved, reduce oxidation and burn
Loss rate and flue gas loss.
Detailed description of the invention
Fig. 1 is the structural schematic diagram for the air/fuel ratio detecting apparatus that better embodiment of the present invention provides.
In all the appended drawings, identical appended drawing reference is used to denote the same element or structure, in which: 1- oxygen determination sensing
Device, 2- analyzer, 3- data processing control center, 4- temperature sensor, 5- pressure sensor, 6- cooling air pipe, 7- are combustion-supporting
Air intake, 8- burner, 9- fuel gas inlet, 10- burning furnace shell, 11- resistance wire, 12- thermal insulation material.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.As long as in addition, technical characteristic involved in the various embodiments of the present invention described below
Not constituting a conflict with each other can be combined with each other.
Referring to Fig. 1, the air/fuel ratio detecting apparatus that better embodiment of the present invention provides, the air/fuel ratio detecting apparatus is suitable
For the preposition detection of industrial furnace combustion gas.The air/fuel ratio detecting apparatus is carried out by the residual oxygen content of flue gas to combustion gas work stove
Line real-time detection and control obtain optimal combustion efficiency, reduce the combustion furnace energy consumption.
The air/fuel ratio detecting apparatus includes oxygen analyser, data processing control center 3, temperature sensor 4, pressure sensor
5, cooling air pipe 6, combustion air inlet 7, burner 8, fuel gas inlet 9, combustion furnace and resistance wire 11.The oxygen analyser setting
In the back-end ductwork of the combustion furnace, and it is electrically connected with the data processing centre 3, the temperature sensor 4 and described
Pressure sensor 5 is arranged on the combustion furnace.The cooling air pipe 6 is connected with the combustion furnace.The burner 8
It is set to the bottom end of the combustion furnace, the combustion air inlet 7 and the fuel gas inlet 9 are all set in the burner 8.Institute
It states resistance wire 11 to be set in the combustion furnace, be electrically connected with data control processing center 3.
The combustion furnace include burn furnace shell 10 and be contained in it is described burning furnace shell 10 in boiler tube, the boiler tube with
The inner wall of the burning furnace shell 10 is provided with predetermined space.Filled with heat preservation between the burning furnace shell 10 and the boiler tube
Material 12, the thermal insulation material 12 is for keeping the temperature the combustion furnace, to reduce heat energy loss.
Residual oxygen content of the oxygen analyser for the flue gas in back-end ductwork described in real-time detection, and the residual oxygen that will test
Content data is transferred to the data processing control center 3, and the data processing control center 3 handles the residual oxygen received
Content data is to obtain the completely burned air-fuel ratio that fuel gases calorific value is in variable condition, and then the mistake as needed for each furnace section of industrial furnace
Amount air coefficient corrects the air-fuel ratio of each furnace section, and the data processing control center 3 controls the combustion air inlet 7 and described
Fuel gas inlet 9 is so that the combustion furnace works under suitable air-fuel ratio.In present embodiment, the oxygen analyser includes oxygen determination
Sensor 1 and analyzer 2, the oxygen sensors 1 are connected to the boiler tube, and the analyzer connects the oxygen sensors 1
And the data processing control center 3；The oxygen analyser is Oxygen Analyser on Zirconia Cell, and the oxygen sensors 1 are zirconium oxide oxygen determinations
Sensor.
The temperature sensor 4 and the pressure sensor 5 are all connected to the boiler tube, and the temperature sensor 4 is used for
The temperature data that detects the temperature in the combustion furnace, and will test is transferred to the data processing control center 3, institute
It states data processing control center 3 and judges the temperature received and the set temperature in the back-end ductwork, when the temperature received
Greater than the back-end ductwork set temperature when, the cooling air pipe 6 is started to work to reduce the temperature in the back-end ductwork
Degree, and then it is reduced to the temperature in the back-end ductwork in the operating temperature of the oxygen analyser.The pressure sensor 5 is used for
The pressure data that detects the pressure in the combustion furnace, and will test is transferred to the data processing control center 3, institute
It states data processing control center 3 and the combustion furnace is monitored in real time according to the temperature data and the pressure data that receive
Combustion case.
The resistance wire 11 is wound around on the boiler tube, and it is electrically connected with the data processing control center 3.Work as institute
State the set temperature that the temperature from the temperature sensor 4 that data processing control center 3 receives is less than the combustion furnace
When, the data processing control center 3 controls the resistance wire 11 and starts to work, until the data processing control center 3 connects
For the temperature value being subject in the range of the set temperature, the resistance wire 11 just has working condition to switch to idle state.This reality
It applies in mode, the resistance wire 11 uses different screw pitch coilings, i.e., the described resistance wire 11 spiral shell smaller, intermediate using both ends screw pitch
It is wound on the boiler tube away from biggish mode, the screw pitch at 11 both ends of resistance wire is less than in-between screw pitch；The resistance wire
11 be made of nichrome.
The burner 8 is sent into the boiler tube for mixing combustion air and combustion gas, and by the mixed gas being mixed to get
It is interior.The data processing control center 3 controls the combustion air inlet 7 and the fuel gas inlet 9 and is helped described in entrance with controlling
The volume of the combustion air of burner 8 and the volume of the combustion gas, and then control described in the gaseous mixture into the boiler tube
The volume ratio of combustion air and the combustion gas.The combustion air inlet 7 is connected with the cooling air pipe 6 by control valve
It connects.In present embodiment, the data processing control center 3 is PLC control system；The burner 8 is pre-mixing type combustion apapratus.
Air/fuel ratio detecting apparatus provided by the invention, coiling resistance wire on boiler tube, the resistance wire are convenient in burning temperature
The temperature in the occasion control combustion furnace of efficiency of combustion is influenced when degree fluctuation is larger, guarantees operating temperature, while can be preferably
Keep in-furnace temperature uniform；The data processing control center matches achievable combustion furnace with the resistance wire and automatically controls temperature
Degree improves efficiency of combustion, makes combustion gas completely burned.In addition, using the oxygen-containing residual of oxygen analyser real-time detection flue gas, and then through institute
The combustion state that real-time monitoring combustion furnace can be achieved after data processing control center is handled is stated, heating furnace burning air-fuel can be improved
Than controlling precision, oxidization burning loss rate and flue gas loss are reduced.
As it will be easily appreciated by one skilled in the art that the foregoing is merely illustrative of the preferred embodiments of the present invention, not to
The limitation present invention, any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should all include
Within protection scope of the present invention.
Claims (10)
1. a kind of air/fuel ratio detecting apparatus, it is suitable for the preposition detection of industrial furnace combustion gas, the air/fuel ratio detecting apparatus includes combustion
Burn furnace, resistance wire (11), oxygen analyser and data processing control center (3), it is characterised in that:
The combustion furnace includes the boiler tube for burning furnace shell (10) and being contained in burning furnace shell (10)；The resistance wire
(11) it is wound on the boiler tube, is electrically connected with the data processing control center (3), the data processing control center
(3) resistance wire (11) is in running order or idle state for controlling, so that the temperature in the combustion furnace maintains
In operating temperature；
The oxygen analyser is connected to the back-end ductwork of the combustion furnace, is used for the residual oxygen of the flue gas in real-time detection back-end ductwork
Content, and the residual oxygen content data that will test are transferred to the data processing control center (3), in the data processing and control
The residual oxygen content data that receive of the heart (3) processing to obtain the completely burned air-fuel ratio that fuel gases calorific value is in variable condition,
And then the excess air coefficient as needed for each furnace section of industrial furnace corrects the air-fuel ratio of each furnace section, realizes industrial furnace efficiency of combustion
It improves, reduces oxidization burning loss rate and flue gas loss.
2. air/fuel ratio detecting apparatus as described in claim 1, it is characterised in that: the air/fuel ratio detecting apparatus further includes difference
Temperature sensor (4) and pressure sensor (5) on the combustion furnace are set, and the temperature sensor (4) is for detecting institute
The temperature data stating the temperature in combustion furnace, and will test is transferred to the data processing control center (3)；The pressure
Force snesor (5) is used to detect the pressure in the combustion furnace, and the pressure data that will test is transferred to the data processing
Control centre (3), the data processing control center (3) are supervised according to the temperature data and the pressure data that receive
Survey the combustion case in the burner hearth of the combustion furnace.
3. air/fuel ratio detecting apparatus as claimed in claim 2, it is characterised in that: the air/fuel ratio detecting apparatus further includes cooling
Air hose (6), the cooling air pipe (6) are connected to the back-end ductwork of the combustion furnace, for in the back-end ductwork
Flue gas cool down.
4. air/fuel ratio detecting apparatus as claimed in claim 3, it is characterised in that: the combustion furnace is provided with set temperature, institute
The set temperature for stating temperature and the oxygen analyser that data processing control center (3) judgement receives, when the temperature received is big
When the set temperature, the data processing control center (3) controls the cooling air pipe (6) and starts to work to reduce
The temperature in back-end ductwork is stated, and then the temperature in the back-end ductwork maintains in the operating temperature range of the oxygen analyser；
When the temperature from the temperature sensor (4) that the data processing control center (3) receives is less than the combustion furnace
When set temperature, the data processing control center (3) controls the resistance wire (11) and starts to work, until the data processing
The temperature that control centre (3) receives is in the range of the set temperature.
5. air/fuel ratio detecting apparatus as described in claim 1, it is characterised in that: the air/fuel ratio detecting apparatus further includes burning
Device (8), combustion air inlet (7) and fuel gas inlet (9) are also respectively provided on the burner (8), and the burner (8) is used
It is passed after being mixed the combustion air for coming from the combustion air inlet (7) and the combustion gas for coming from the fuel gas inlet (9)
It is sent in the boiler tube.
6. air/fuel ratio detecting apparatus as claimed in claim 5, it is characterised in that: the data processing control center (3) is also used
In the control combustion air inlet (7) and the fuel gas inlet (9) to control the combustion air for entering the combustion-supporting
Volume and the combustion gas volume, and then control enter the boiler tube in the combustion air and the combustion gas volume
Than.
7. air/fuel ratio detecting apparatus as described in claim 1, it is characterised in that: the oxygen analyser includes being connected to the burning
The oxygen sensors (1) and analyzer (2) of furnace, the analyzer (2) connect the oxygen sensors (1) and the data processing
Control centre (3).
8. air/fuel ratio detecting apparatus as claimed in claim 7, it is characterised in that: the oxygen analyser is Oxygen Analyser on Zirconia Cell, institute
Stating oxygen sensors (1) is zircite oxygen transmitter.
9. air/fuel ratio detecting apparatus as described in claim 1, it is characterised in that: the screw pitch at resistance wire (11) both ends is less than
In-between screw pitch, and the resistance wire (11) is made of nichrome.
10. air/fuel ratio detecting apparatus as described in claim 1, it is characterised in that: the boiler tube and the burning furnace shell
(10) it is provided with predetermined space between inner wall, thermal insulation material is filled between the burning furnace shell (10) and the boiler tube
(12), the thermal insulation material (12) is for keeping the temperature the combustion furnace.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611226213.1A CN106766974B (en) | 2016-12-27 | 2016-12-27 | A kind of air/fuel ratio detecting apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611226213.1A CN106766974B (en) | 2016-12-27 | 2016-12-27 | A kind of air/fuel ratio detecting apparatus |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106766974A CN106766974A (en) | 2017-05-31 |
| CN106766974B true CN106766974B (en) | 2019-04-12 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201611226213.1A Expired - Fee Related CN106766974B (en) | 2016-12-27 | 2016-12-27 | A kind of air/fuel ratio detecting apparatus |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108073148B (en) * | 2017-12-13 | 2019-03-19 | 中国建材国际工程集团有限公司 | The control system and control method of glass melter based on computer control |
| CN109987925A (en) * | 2019-04-15 | 2019-07-09 | 丽水学院 | A method of kiln and application kiln that firing Longquan celadon electrical bond fires Longquan celadon |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2443373Y (en) * | 2000-10-17 | 2001-08-15 | 张清林 | Oxygen meter for combustion equipment |
| US6918385B2 (en) * | 2001-11-08 | 2005-07-19 | Hitachi, Ltd. | Air-fuel ratio detecting apparatus of engine and method thereof |
| CN1959399A (en) * | 2005-11-01 | 2007-05-09 | 比亚迪股份有限公司 | System for testing performance of oxygen sensor in use for car |
| CN101281153A (en) * | 2008-05-21 | 2008-10-08 | 宁波大学 | Air/fuel ratio oxygen sensor performance measuring system |
| CN104633698A (en) * | 2014-12-12 | 2015-05-20 | 北京首钢自动化信息技术有限公司 | System and method for automatically controlling content of residual oxygen in regenerative heating furnace |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040129562A1 (en) * | 2003-01-02 | 2004-07-08 | Pavel Shuk | Low impedance oxygen sensor and associated methods |
-
2016
- 2016-12-27 CN CN201611226213.1A patent/CN106766974B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2443373Y (en) * | 2000-10-17 | 2001-08-15 | 张清林 | Oxygen meter for combustion equipment |
| US6918385B2 (en) * | 2001-11-08 | 2005-07-19 | Hitachi, Ltd. | Air-fuel ratio detecting apparatus of engine and method thereof |
| CN1959399A (en) * | 2005-11-01 | 2007-05-09 | 比亚迪股份有限公司 | System for testing performance of oxygen sensor in use for car |
| CN101281153A (en) * | 2008-05-21 | 2008-10-08 | 宁波大学 | Air/fuel ratio oxygen sensor performance measuring system |
| CN104633698A (en) * | 2014-12-12 | 2015-05-20 | 北京首钢自动化信息技术有限公司 | System and method for automatically controlling content of residual oxygen in regenerative heating furnace |
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